/*
 * This file is part of the Flowee project
 * Copyright (C) 2025 Tom Zander <tom@flowee.org>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
import QtQuick
import QtQuick.Controls.Basic as QQC2
import "../Flowee" as Flowee

Item {
    id: root
    // please only set it ever to be the first of the month!
    required property date month
    // the date before which all items have lower visibility
    property date oldCutoff: new Date(1978, 0, 1)
    // when the user clicks on a date.
    property int selected: 0

    // an array of ints.
    property var highlights: []
    property string monthFormat: "MMM yy"

    width: implicitWidth
    height: implicitHeight
    implicitWidth: 88
    implicitHeight: days.y + 6 * 13
    onVisibleChanged: if (visible) selected = 0;
    QQC2.Label {
        id: monthLabel
        anchors.horizontalCenter: parent.horizontalCenter
        text: Qt.locale().toString(root.month, root.monthFormat)
        font.pixelSize: 9
        color: palette.dark
    }

    Rectangle { // sundays
        anchors.top: days.top
        anchors.topMargin: root.month.getDay() === 0 ? 0 : 10
        anchors.bottom: days.bottom
        width: 10
        color: palette.highlight
        opacity: 0.2
        radius: 3
    }
    Rectangle { // saturdays
        anchors.top: days.top
        anchors.bottom: days.bottom
        anchors.bottomMargin: {
            var last = new Date(root.month.getFullYear(), root.month.getMonth() + 1, 0).getDay();
            return last === 6 ? 0 : 13;
        }
        anchors.right: days.right
        width: 10
        color: palette.highlight
        opacity: 0.27
        radius: 3
    }
    Flow {
        id: days
        anchors.top: monthLabel.bottom
        width: parent.width
        spacing: 3

        property int lowBrightnessDay: {
            if (isNaN(root.oldCutoff))
                return -1;
            let cutOff = root.oldCutoff;
            let current = root.month; // remember, this one is always the first of the month
            let copy = new Date(cutOff.getFullYear(), cutOff.getMonth(), 1);
            if (current < copy) // the entire month is before cutoff.
                return 40;
            if (current.getFullYear() !== cutOff.getFullYear()
                    || current.getMonth() !== cutOff.getMonth())
                return -1;
            return cutOff.getDate() - 1;
        }

        Repeater {
            model: root.month.getDay()
            Item { width: 10; height: 10 }
        }
        Repeater {
            model: {
                // a dirty JavaScript hack. Day zero is actually the last day in the previous month.
                var hack = new Date(root.month.getFullYear(), root.month.getMonth() + 1, 0)
                return hack.getDate();
            }
            Item {
                width: 10
                height: theLabel.contentHeight
                property bool highlighted: root.highlights.includes(modelData + 1)
                Rectangle {
                    color: parent.highlighted ? mainWindow.floweeGreen : "#00000000"
                    width: parent.width
                    height: width
                    anchors.centerIn: parent
                    radius: 6
                }
                QQC2.Label {
                    id: theLabel
                    text: (modelData + 1)
                    width: parent.width
                    horizontalAlignment: Text.AlignHCenter
                    font.pixelSize: 7
                    color: parent.highlighted ? "black" : palette.dark
                    opacity: modelData < days.lowBrightnessDay ? 0.3 : 1
                }
                MouseArea {
                    anchors.fill: parent
                    enabled: modelData >= days.lowBrightnessDay
                    onClicked: root.selected = modelData + 1;
                }
            }
        }
    }
}